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Commit e4b05067 authored by Nathan Coppin's avatar Nathan Coppin
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Updated docu

parent b089bbb3
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python/fluid.py
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python/scontact.py
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......@@ -60,7 +60,7 @@ def _np2c(a,dtype=np.float64) :
class ParticleProblem :
"""Create the numerical structure containing all the physical particles that appear in the problem"""
"""Creates the numerical structure containing all the physical particles that appear in the problem"""
def _get_array(self, fName, dtype) :
f = getattr(self._lib,"particleProblem"+fName)
......@@ -93,14 +93,14 @@ class ParticleProblem :
return np.ctypeslib.as_array(buf)
def __init__(self, dim, friction_enabled=False, rotation_enabled=False) :
"""Build the particles contanier structure.
"""Builds the particles contanier structure.
Keyword arguments:
dim -- dimension of the problem
dim -- Dimension of the problem
Raises:
ValueError -- if dimension differs from 2 or 3
NameError -- if C builder cannot be found
ValueError -- If dimension differs from 2 or 3
NameError -- If C builder cannot be found
"""
self._dim = dim
self._friction_enabled = friction_enabled
......@@ -133,72 +133,86 @@ class ParticleProblem :
self._triangletype = np.dtype(bndtype+[('p',np.float64,(3,dim))])
def __del__(self):
"""Delete the particle solver structure."""
"""Deletes the particle solver structure."""
if(self._p is not None) :
self._lib.particleProblemDelete(self._p)
def volume(self):
"""Return the list of particle volumes."""
"""Returns the list of particle volumes."""
if self._dim == 2 :
return np.pi * self._get_matrix("Particle", 2)[:, [0]]**2
else :
return 4./3.*np.pi * self._get_matrix("Particle", 2)[:, [0]]**3
def r(self) :
"""Return the list of particle radii."""
"""Returns the list of particle radii."""
return self._get_matrix("Particle", 2)[:, 0][:,None]
def mass(self):
"""Return the list of particle masses."""
"""Returns the list of particle masses."""
return self._get_matrix("Particle", 2)[:, 1][:,None]
def position(self):
"""Return the list of particle centre position vectors."""
"""Returns the list of particle centre position vectors."""
return self._get_matrix("Position", self._dim)
def velocity(self):
"""Return the list of particle velocity vectors."""
"""Returns the list of particle velocity vectors."""
return self._get_matrix("Velocity", self._dim)
def omega(self):
"""Return the list of particle angular velocity."""
"""Returns the list of particle angular velocity."""
assert self._friction_enabled and self._rotation_enabled
return (self._get_matrix("Omega", 1)) if self._dim==2 else self._get_matrix("Omega", 3)
def particle_material(self):
"""Returns the list of particle materials."""
return self._get_idx("ParticleMaterial")
def disk_tag(self):
"""Returns the list of boundary disk tag numbers."""
return self._get_idx("DiskTag")
def disks(self) :
"""Returns the list of boundary disks."""
return self._get_array("Disk",self._disktype)
def forced_flag(self):
"""Returns the list of particle flags indicating whether they are fixed or not."""
return self._get_idx("ForcedFlag")
def get_tag_id(self, tag = "default"):
"""Returns the number associated to a string tag."""
return self._lib.particleProblemGetMaterialTagId(self._p, tag.encode())
def n_particles(self) :
"""Returns the number of particles."""
self._lib.particleProblemNParticle.restype = c_size_t
return self._lib.particleProblemNParticle(self._p)
def mu(self) :
return self._get_matrix("Mu", 1)
"""Returns the matrix of the friction coefficients between materials."""
return self._get_matrix("Mu", self._lib.particleProblemNMaterial(self._p))
def segments(self):
"""Returns the list of boundary segments."""
return self._get_array("Segment",self._segmenttype)
def triangles(self):
"""Returns the list of boundary triangles."""
if self._dim == 2:
return np.ndarray((0),self._triangletype)
return self._get_array("Triangle",self._triangletype)
def contact_forces(self):
"""Returns the contact forces on each grain."""
return (self._get_matrix("ContactForces",self._dim))
def get_boundary_impulsion(self,tag="default") :
def get_boundary_forces(self,tag="default") :
"""Returns the net force acting on a boundary because of the contacts.
Keyword arguments:
tag -- Name of the boundary
"""
self._lib.particleProblemGetTagId.restype = c_size_t
tag = self._lib.particleProblemGetTagId(self._p, tag.encode())
def compute_fn_ft(contact_name,objects,tag) :
......@@ -219,10 +233,12 @@ class ParticleProblem :
f+= compute_fn_ft("particle_triangle",self.triangles(),tag)
return f
def disks(self) :
return self._get_array("Disk",self._disktype)
def set_boundary_velocity(self, tag, v) :
"""Sets the velocity of a boundary to a given value.
Keyword arguments:
tag -- Name of the boundary
v -- Velocity vector to be given to the boundary
"""
self._lib.particleProblemGetTagId.restype = c_size_t
tag = self._lib.particleProblemGetTagId(self._p, tag.encode())
disks = self.disks()
......@@ -238,7 +254,7 @@ class ParticleProblem :
Only in 2D
Keyword arguments:
tag -- Name of the boundary
vt -- velocity in the tangent direction
vt -- Velocity in the tangent direction
"""
assert self._friction_enabled
assert self._dim==2
......@@ -254,27 +270,29 @@ class ParticleProblem :
""" Sets the friction coefficient between two materials.
Keyword arguments:
mu -- value of the friction coefficient
mat0 -- first material
mat1 -- second material
mu -- Value of the friction coefficient
mat0 -- First material
mat1 -- Second material
"""
assert self._friction_enabled
self._lib.particleProblemSetFrictionCoefficient(self._p, c_double(mu), mat0.encode(),mat1.encode())
def iterate(self, dt, forces,tol=1e-8,force_motion=0) :
"""Compute iteratively the set of velocities that respect the non-interpenetration constrain.
"""Computes iteratively the set of velocities that respect the non-interpenetration constrain.
Returns 1 if the computation converged, 0 otherwise.
Keyword arguments:
dt -- numerical time step
forces -- list of vectors containing the forces applied on the particles
tol -- optional argument defining the interpenetration tolerance to stop the NLGS iterations of the NSCD
dt -- Numerical time step
forces -- List of vectors containing the forces applied on the particles
tol -- Optional argument defining the interpenetration tolerance to stop the NLGS iterations of the NSCD
force_motion -- Optional argument allowing to move the grains if convergence has not been reached when set to 1
"""
self._lib.particleProblemIterate.restype = c_int
return self._lib.particleProblemIterate(self._p, c_double(np.min(self.r()) if self.r().size != 0 else tol), c_double(dt), c_double(tol), c_int(-1),c_int(force_motion),_np2c(forces))
def get_contacts(self,contact_type) :
"""Gives the contact forces. Attention : during the resolution fo the contacts,
the considered quantities are impulses, while forces are written and read."""
"""Gives the contact forces. Warning : during the resolution fo the contacts,
the considered quantities are impulses, while forces are written and read.
"""
ctype = {"particle_particle":0,"particle_disk":1,"particle_segment":2,"particle_triangle":3}[contact_type]
n = self._lib.particleProblemContactN(self._p,c_int(ctype))
basis = np.ndarray((n,self._dim*self._dim),dtype=np.float64,order="C")
......@@ -286,14 +304,23 @@ class ParticleProblem :
return o,v,basis
def computeStressTensor(self, nodes, radius):
"""Compute the stres tensor of the granular material"""
"""Computes the stress tensor of the granular material
Keyword arguments:
nodes -- Array of nodes at which to compute the stress tensor
r -- Radius within which the contact forces will be averaged
"""
n_nodes = len(nodes[:,0])
s = np.ndarray((n_nodes,self._dim**2))
self._lib.particleProblemComputeStressTensor(self._p,_np2c(nodes[:,:self._dim]),c_double(radius),c_int(n_nodes),_np2c(s))
return s
def write_vtk(self, odir, i, t) :
"""Write output files for post-visualization."""
"""Writes output files for post-visualization.
Keyword arguments:
odir -- Directory in which to write the file
i -- Number of the fiel to write
t -- Time at which the simulation is
"""
v = self.velocity()
if self._rotation_enabled:
......@@ -342,7 +369,12 @@ class ParticleProblem :
VTK.write_multipart(odir+"/particle_problem",["particles_%05d.vtp"%i,"boundaries_%05d.vtu"%i,"contacts_%05d.vtp"%i],i,t)
def read_vtk(self,dirname,i,contact_factor=1) :
"""Read an existing output file to set the particle data."""
"""Reads an existing output file to set the particle data.
Keyword arguments:
dirname -- Path to the directory of the file to read
i -- Number of the file to read
contact_factor -- Factor that determines how to take the read contacts into account
"""
self._lib.particleProblemClearBoundaries(self._p)
x,_,d,cdata,fdata = VTK.read(dirname+"/particles_%05d.vtp"%i)
matnames = VTK.string_array_decode(fdata["MaterialNames"])
......@@ -405,41 +437,67 @@ class ParticleProblem :
self._lib.particleProblemSetContacts(self._p,c_int(t.shape[0]),_np2c(o,np.uint64),_np2c(v),_np2c(basis),_np2c(t,np.int32))
def add_boundary_disk(self, x0, r, tag, material="default") :
"""Adds a boundary disk.
Keyword arguments:
x0 -- Tuple of the coordinates of the centre
r -- Disk radius
tag -- Disk tag
material -- Disk material
"""
self._lib.particleProblemAddBoundaryDisk.restype = c_size_t
return self._lib.particleProblemAddBoundaryDisk(self._p, self._coord_type(*x0), c_double(r), tag.encode(),material.encode())
def add_boundary_segment(self, x0, x1, tag, material="default") :
"""Adds a boundary segment.
Keyword arguments:
x0 -- Tuple of the coordinates of the first endpoint
x1 -- Tuple of the coordinates of the second endpoint
tag -- Segment tag
material -- Segment material
"""
self._lib.particleProblemAddBoundarySegment.restype = c_size_t
return self._lib.particleProblemAddBoundarySegment(self._p, self._coord_type(*x0), self._coord_type(*x1), tag.encode(),material.encode())
def add_boundary_triangle(self, x0, x1, x2, tag, material="default") :
"""Adds a boundary triangle.
Keyword arguments:
x0 -- Tuple of the coordinates of the first summit
x1 -- Tuple of the coordinates of the second summit
x2 -- Tuple of the coordinates of the third summit
tag -- Triangle tag
material -- Triangle material
"""
if self._dim != 3 :
raise NameError("Triangle boundaries only available in 3D")
self._lib.particleProblemAddBoundaryTriangle.restype = c_size_t
return self._lib.particleProblemAddBoundaryTriangle(self._p, self._coord_type(*x0), self._coord_type(*x1), self._coord_type(*x2), tag.encode(),material.encode())
def add_particle(self, x, r, m, tag="default",forced = 0):
"""Add a particle in the particle container.
"""Adds a particle in the particle container.
Keyword arguments:
x -- tuple to set the centre particle position
r -- particle radius
m -- particle mass
tag -- particle tag
x -- Tuple to set the centre particle position
r -- Particle radius
m -- Particle mass
tag -- Particle material
forced -- Flag indicating whether the particle is forced or not
"""
self._lib.particleProblemAddParticle(self._p, self._coord_type(*x), c_double(r), c_double(m), tag.encode(), c_int(forced))
def add_particles(self, x, r, m, v=None, omega=None, tag="default", forced=None, contact_forces=None):
"""Add particles in the particle container.
"""Adds particles in the particle container.
Keyword arguments:
x -- array with the particles's centers position
r -- array with the particles's radii
m -- array with the particles's masses
v -- array with the particles's velocities
omega -- array with the particles's angular velocities
tag -- particle tag
forced -- array of flags for particle forcing
contact_forces -- array of contact forces between the particles
x -- Array with the particles's centers position
r -- Array with the particles's radii
m -- Array with the particles's masses
v -- Array with the particles's velocities
omega -- Array with the particles's angular velocities
tag -- Particle material
forced -- Array of flags indicating whether the particles are forced or not
contact_forces -- Array of contact forces between the particles
"""
n_particles = len(m)
tags = np.ones(n_particles) * self.get_tag_id(tag)
......@@ -454,41 +512,41 @@ class ParticleProblem :
self._lib.particleProblemAddParticles(self._p, c_int(n_particles), _np2c(x), _np2c(m), _np2c(r),_np2c(v), _np2c(omega), _np2c(tags,dtype=np.int32), _np2c(forced,dtype=np.int32), _np2c(contact_forces))
def set_use_queue(self, use_queue=1):
"""Enable the use of the queue if 1 and disables it if 0."""
"""Enables the use of the queue if 1 and disables it if 0."""
self._lib.particleProblemSetUseQueue(self._p, c_int(use_queue))
def get_tagnames(self):
"""Return the names of the boundaries """
"""Returns the names of the boundaries """
self._lib.particleProblemGetTagName.restype = c_char_p
ntagname = self._lib.particleProblemNTag(self._p)
tagnames = list([self._lib.particleProblemGetTagName(self._p,i) for i in range(ntagname)])
return tagnames
def clear_boundaries(self):
"""Remove the boundaries."""
"""Removes the boundaries."""
self._lib.particleProblemClearBoundaries(self._p)
def _save_contacts(self):
"""Save the contacts from the current time step."""
"""Saves the contacts from the current time step."""
self._lib.particleProblemSaveContacts(self._p)
def _restore_contacts(self):
"""Restore the saved contacts from the previous time step."""
"""Restores the saved contacts from the previous time step."""
self._lib.particleProblemRestoreContacts(self._p)
def remove_particles_flag(self,flag) :
"""Remove particles based on given flag."""
"""Removes particles based on given flag."""
if flag.shape != (self.n_particles(),) :
raise NameError("size of flag array should be the number of particles")
self._lib.particleProblemRemoveParticles(self._p, _np2c(flag,np.int32))
def load_msh_boundaries(self, filename, tags, shift=None,material="default") :
"""Load the numerical domain and set the physical boundaries the particles cannot go through.
"""Loads the numerical domain and set the physical boundaries the particles cannot go through.
Keyword arguments:
filename -- name of the msh file
tags -- tags of physical boundary defined in the msh file
shift -- optional argument to shift the numerical domain
material -- material of the boundary
filename -- Name of the msh file
tags -- Tags of physical boundary defined in the msh file
shift -- Optional argument to shift the numerical domain
material -- Material of the boundary
"""
if shift == None :
shift = [0]*self._dim
......
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